Počet záznamů: 1  

High temperature dislocation processes in precipitation hardened crystals investigated by a 3D discrete dislocation dynamics

  1. 1.
    0480710 - ÚFM 2018 RIV GB eng J - Článek v odborném periodiku
    Záležák, Tomáš - Svoboda, Jiří - Dlouhý, Antonín
    High temperature dislocation processes in precipitation hardened crystals investigated by a 3D discrete dislocation dynamics.
    International Journal of Plasticity. Roč. 97, OCT (2017), s. 1-23. ISSN 0749-6419. E-ISSN 1879-2154
    Grant CEP: GA ČR(CZ) GA14-22834S; GA ČR(CZ) GA202/09/2073; GA ČR(CZ) GD106/09/H035; GA MŠMT(CZ) EE2.3.20.0214; GA MŠMT OC 162
    GRANT EU: European Commission(XE) 309916 - Z-ULTRA
    Institucionální podpora: RVO:68081723
    Klíčová slova: 3D discrete dislocation dynamics * Dislocations * Strengthening mechanisms * Low angle grain boundaries * Particulate reinforced material
    Obor OECD: Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics
    Impakt faktor: 5.502, rok: 2017

    3D discrete dislocation dynamics is employed to investigate motion of general mixed
    dislocation segments subjected to high temperature loadings in microstructures with
    impenetrable particles. The implementations of the model first address several benchmark
    processes including shrinkage of a glissile dislocation loop driven by self-stresses and an
    annihilation of mutually interacting co-axial prismatic dislocation loops. In particular, we
    show that models of the microstructure with planar and/or translational symmetry
    improve efficiency, speed and stability of the calculations. Our simulations then focus on
    migration of low angle dislocation boundaries in an array of particles while taking into
    account all mutual dislocation-dislocation interactions and the action of an externally
    applied stress. The results show for the first time that the migration of tilt dislocation
    boundaries in crystals with particles can be associated with threshold stresses. The
    calculated thresholds are in a good agreement with experimental threshold stresses that
    characterize creep behaviour of precipitation hardened alloys.
    Trvalý link: http://hdl.handle.net/11104/0276521

     
     
Počet záznamů: 1  

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